“Kate is a fantastic mum,” an onlooker described to People. “She was calm with the children….She let them have their head.” (Which means she let them run loose.)

The onlooker described one moment where the Duchess had some fun with the kids. “She seemed to say to [the kids], ‘First to the polo field is the winner!’ She was trying to get them tired before they had to get back in the car to leave.”

The observer also said that the Duchess “didn’t get stressed about [photographers being all around], or pass that along to the children. She let them play. She let them get on with it, sliding down the hill and rolling on the grass.”